body{
			padding:0px;
			margin:0px;
			margin:0px auto;
}

#contenedor {
			margin:0px auto;
            width: 900px;
           
        }
 #cabecera {
 			background-image:url(../imagenes/cabecera.jpg);
            background-color: green;
            height:100px;
            padding:5px;
        }
 #barra-lateral {
            background-color: orange;
            float: left;
            width:140px;
            height:100%;
        }
#contenido {
			margin:0px;
			padding:0px;
			margin:0px auto;
            background-color: gray;
            float:left;
            width:760px;
            height:100%;
        }
#pie {
            background-color: white;
			
            clear: both;
			font-size:9px;
        }		
